Enhanced quantum efficiency in polymer/layered silicate nanocomposite light-emitting devices

Light-emitting devices based on environmentally stable polymer/layered sili cate nanocomposite were fabricated by blending poly[2methoxy-5-(2'-ethyl-he xyloxy)-1,4-phenylene vinylene] (MEH-PPV) with organo-clay. The ratio of ME H-PPV/organo-clay was regulated from 5/1 (w/w) to 1/1 (w/w). The light-emit ting device of 1/1 (w/w) blend gives us the highest quantum efficiency, 0.3 8 % ph/el, which is enhanced 100 times compared with the pure MEH-PPV layer device, This 2-dimensional lamellar-type nanocomposite device forms a simi lar electronic structure to that of commonly known quantum well devices. Th us, this method can promote to confine both the electrons and holes to enha nce the recombination rate.